[SOLVED] Re: labelling root file system (RELENG_8)
freebsd at jdc.parodius.com
Wed Jun 8 16:55:18 UTC 2011
On Wed, Jun 08, 2011 at 07:40:03PM +0300, Andriy Gapon wrote:
> on 08/06/2011 19:26 Jeremy Chadwick said the following:
> > I have the exact same question except not with regards to labels but
> > toggling TRIM capability on the root filesystem.
> > - Start system
> > - At loader, boot single-user (option 4)
> > - At prompt choose /bin/sh
> > - mount -a
> I think that this is a culprit.
I'll try removing this step.
> > - tunefs -t enable /dev/ada0s1a --- fails
> Shouldn't you have / mounted r/o here?
> BTW, AFAIR, *re*-mounting root read-only won't help; it needs to have never been
> mounted r/w.
I'm a little confused by this sentence, so my apologise in advance. /
is mounted read-only in single-user by default. Did you mean I should
make it r/w by doing "mount -u -o rw /" ? I may have omitted this step.
I will re-verify the exact procedure and exact steps in a moment, and
> > - sysctl kern.geom.debugflags=16
> > - tunefs -t enable /dev/ada0s1a --- works
> > - tunefs -p /dev/ada0s1a -- shows TRIM enabled
> > - reboot
> I think that at this step your superblock on disk gets re-written with its copy in
> memory which has never been updated. But not sure.
Hmm, I sure hope that isn't the case. That would mean the only time a
person can use tunefs on a root filesystem is when they either do it
manually during the FreeBSD installation (adding "-t" to the list of
newfs flags in the filesystem creation UI), or if they boot off of some
other medium (USB flash drive, CD, PXE, etc.).
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, US |
| Making life hard for others since 1977. PGP 4BD6C0CB |
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